中文编码与解码

<?php

function hex_encode($s) {
    $s = iconv('UTF-8', 'GBK', $s);
    return preg_replace('/(.)/es', "str_pad(dechex(ord('\1')),2,'0',STR_PAD_LEFT)", $s);
}

function hex_decode($s) {
    return preg_replace('/(w{2})/e', "chr(hexdec('\1'))", $s);
}


var_dump(hex_encode("李照耀"));
var_dump(hex_decode("c0eed5d5d2ab"));
?>